iPhone Screenshots


Knock and Apple Watch: a match made in heaven. Knock 2.0 makes unlocking your Mac faster and more secure than ever.

You keep your iPhone with you all the time. Now you can use it as a password. You never even have to open the app— just knock on your phone twice, even when it’s in your pocket, and you're in. And if you have an Apple Watch, you can unlock your Mac right from your wrist.

Using Knock won't drain your iPhone's battery, even if you use it all day every day. Knock securely communicates with your Mac using Bluetooth Low Energy, a new technology that draws very little power.


Have a question? Email us at help@knocktounlock.com and we'll get back to you within a day.

What’s New

Version 2.0.2

- Fixes a bug that could cause Knock to fail to connect when your Mac is locked.

Ratings and Reviews

2.4 out of 5
127 Ratings
127 Ratings
Bryen ,

Follow The Instructions… and It’s Great!

Like others here, I was apprehensive about buying this based on the reviews… but I read reviews that said.. “follow the instructions and you’ll have no problems”… and they were right. I have a 2012 Mac Mini, iPhone 6+, and Watch Sport, all running the latest software versions available as of this writing. It works PERFECTLY. Yes.. you have to wake your Mac up first if it’s asleep.. press a key, wiggle the mouse, smack the magic trackpad, whatever. Then I literally pick my phone up and knock on it twice like I’m knocking on a door.. without even waking the phone up. BUT- when I leave my phone in the other room and I’m wearing my Watch, I can just raise my wrist, swipe up to reveal the Knock Glance, tap, and it unlocks my Mac! It even shows the status of my Mac.. locked or unlocked. It may sound like a lot but it’s honestly twice as fast as typing in my password each time. AND I can LOCK my Mac while I’m ‘Netflix-ing and Chilling’ in the living room. Highly recommended. Excellent app.

Mark Lalor ,

Works Great, Developer Updates

I've been using this app to avoid typing in my long password and it's been great to me. After sending an email about some macOS Sierra glitches, the developer had an update in a few days fixing all the glitches.

It's true that 5% of the time, there will be some sort of disconnectivity between the app and computer, forcing you to type your password. Also if you leave your computer for a few days, it will take the bluetooth maybe 10 seconds to find your mac versus like 2 seconds if you had used your computer recently. These are not really avoidable for the developer so they do not annoy me at all.

If you really want some 100% smooth implementation of this feature, buy the $300 Apple Watch. If not, enjoy this highly functional app for $5.

Mac Pro User - Jasen ,

Works Perfectly

So I was a bit uneasy when buying this app because of the misguiding comments, but after much research (YouTube,Google,etc) I finally had the nerve to buy the app. And I am not disappointed. This app really works as advertised, and it works while I use other apps on my phone, which I thought it was pretty neat. The setup with almost instant, and works when my iPhone is locked. Yes, it really does, however you have to Wake up the computer first, WAIT for the circle to fill up, THEN knock. Trust me, there really isn't any lag or wait time. Maybe just a second or two. But very useful app, I recommend it to those who have very long passwords.


Knock Software, Inc
12 MB

Requires iOS 7.0 or later. Compatible with iPhone 4s, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Wi-Fi (3rd generation), iPad (3rd generation) Wi‑Fi + Cellular, iPad Wi-Fi (4th generation), iPad (4th generation) Wi‑Fi + Cellular, iPad mini Wi-Fi, iPad mini Wi-Fi + Cellular, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, iPad Pro (9.7‑inch), iPad Pro (9.7-inch) Wi‑Fi + Cellular, iPad (5th generation), iPad (5th generation) Wi‑Fi + Cellular, iPad Pro (12.9‑inch) (2nd generation), iPad Pro (12.9‑inch) (2nd generation) Wi‑Fi + Cellular, iPad Pro (10.5‑inch), iPad Pro (10.5-inch) Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro (12.9-inch), iPad Pro (12.9-inch) Wi‑Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi-Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, and iPod touch.



Age Rating
Rated 4+
©Knock Software, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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